An oxygen saturation below 90% is not normal and should be taken seriously. Your symptoms of breathlessness, low oxygen levels, a history of smoking, and feeling suffocated when lying on your right side could be due to conditions such as COPD, pneumonia, pleural disease, heart-related problems, or other lung disorders. This cannot be diagnosed safely without a physical examination and investigations.
Next Steps
Please visit the nearest emergency department or hospital immediately, especially if your oxygen level is consistently below 90% on a reliable pulse oximeter. You may require oxygen therapy and urgent evaluation with a chest X-ray, ECG, blood tests, and possibly a CT scan and pulmonary function tests once you are stable. Continue to avoid smoking completely.
Health Tips
If your oxygen level remains below 90%, or you develop worsening breathlessness, chest pain, bluish lips or fingers, confusion, drowsiness, or difficulty speaking due to breathlessness, do not wait for an online consultation. Seek emergency medical care immediately, as these symptoms can indicate a potentially serious condition requiring urgent treatment.